How hasn't it worked - it appears that, possibly through his incarceration, Venables has picked up some nasty habits, but as far as know he hasn't killed anybody else yet, nor does there seem to be much of a chance that he will do so - correct me if you have evidence to the contrary.

Does he seem rehabilitated to you? Would you trust him with your children? He's re-offended and they've locked him up again - isn't that enough evidence for the failure of his rehabilitation? They got it wrong. He was released as an eighteen year old, not ten, and he has proved that they misjudged him to be fit for release. If the decision to release him was right, he wouldn't be back inside. I only hope they were luckier with Thompson, though I don't suppose we'll ever know for sure.